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| 1.Optimization of acoustic monitoring head voice | 
| 2.Silver capacitor microphone made in Japan | 
| 3.Standard switch enclosure | 
| 1.Area:10~80m² (adjustable) | 
| 2.Audio transmission distance:1000m | 
| 3.Sensitivity:-50dB±3dB | 
| 4.Impedance:600Ω | 
| 5.Signal amplitude:0~6Vp-p | 
| 6.Frequency range:100Hz~15KHz | 
| 7.Power supply:DC6V~12V 20mA | 
| 8.Wire length:95mm | 
| 9.Dimension:88*88*19mm |